Game$how Marathon is an American television program which aired on CBS from May 31, 2006 to June 29, 2006. It is based on the UK series Ant & Dec's Gameshow Marathon which aired on ITV in 2005.

The show features contestants competing in some of television's most historically popular game shows, in a single-elimination format until an ultimate winner is found. Both the UK and US versions featured celebrity contestants.

The US version was produced by FremantleMedia North America and Granada America and was hosted by Ricki Lake and announced by Rich Fields. In the US, the series only aired for a single season, while in the UK a second season aired in 2007, this time entitled Gameshow Marathon and hosted by Vernon Kay. This program was recorded at Stage 46, CBS Television City in Los Angeles, CA, USA.